Image sensor comprising a color splitter with two different refractive indexes, and different height

Abstract

It is proposed an image sensor comprising pixels for acquiring color information from incoming visible light, wherein said image sensor comprising three pixels being partially covered by a color splitter structure for deviating only one color channel of said incoming visible light towards one of said three pixels, and for deviating other colors of said incoming visible light towards the other pixels among said three pixels. The color splitter structure comprises a first (), a second () and a third () parallelepiped structures arranged so that the first and the third parallelepiped structures are side by side and in contact with the second parallelepiped structure, and wherein the first and the third parallelepiped structures have same dimensions, and are made of a same dielectric material, with a refractive index n, and wherein said second parallelepiped structure being smaller in height (H) compared to said first and third parallelepiped structures (H), and wherein said second parallelepip ed structure being made of a dielectric material with a refractive index n L, and wherein the refractive index n H is greater than the refractive index n L.